基于GIS地下水空间数据模型在乌兰盆地的应用

GIS-based Spatial Data Model of Groundwater:A Case Application in Wulan Basin

对地下水系统的各个源、汇项的概化是地下水数值模型模拟计算的基础.由于现有的地下水数据模型都只是为存储地下水系统的常规调查信息而设计,却没有一种数据模型是为了取得其系统概念视图,以便于GIS地下水数据与数值模拟模型的交互.本研究提出了基于对地下水系统的深刻理解而概化的面向对象的地下水数据模型,该模型以一组含水层来表达地下水系统,这些含水层有相应的属性和水体边界条件,并以青海省乌兰盆地勘查区为例,给出了一个地下水系统概化的实例.概化数据模型可以支持有限差分法、有限元法及解析元法等不同的数值模型对地下水进行模拟计算.虽然各数值模型都使用了不同的数值解析方法、数据输入文件和格式,但所有的数值模型都是建立在相同的概化过程之上的,这种新的数据模型体现了这个概化过程.研究实例说明了该数据模型是为地下水系统概化、数据存储及应用各种地下水数值模型的有效方法.地下水数据模型的概化意味着将系统概化融入数据模型将受到新的关注.

Development of a conceptualization of a hydrogeologic system serves as the basis of groundwater modeling.While hte existing groundwater data models were designed to store groundwater system information,none is designed to capture its conceptual view.This study addresses this need by presenting a new object-oriented Conceptualization Groundwater Data Model that represents a groundwater system as a series of aquifer layers with defined aquifer properties and water boundary conditions.A case study is presented that develops the conceptual view of the groundwater system Wulan Basin of Qinghai Province.This single conceptualization is used to support groundwater models across existing technologies of finite difference,finite element,and analytical element methods.While the models each employ different mathematics,data input files,and formats,all model are founded on the same conceptualization process that is represented using this new data model.The case study illustrates the data model’s promise as an effective mechanism for groundwater system conceptualization and data storage,and utility for various groundwater computational models.This conceptualization of a groundwater data model suggests a new focus on incorporating system conceptualization into data model design.